diff --git a/fonts/genttf.ff b/fonts/genttf.ff
index 52de76ddafc..30d1a938ee8 100644
--- a/fonts/genttf.ff
+++ b/fonts/genttf.ff
@@ -1,2 +1,6 @@
 Open($1)
-Generate($2, "ttf", 0);
+flags = 0
+if ($1 == "symbol.sfd")
+    flags = 0x2000
+endif
+Generate($2, "ttf", flags)